Abstract: The effect of boron content(0 to 0.48wt％) on isothermal oxidation behaviour of Ni3Al at 750 to 1150℃ for 3 to 100 h has been studied. The results show that the isothermal oxidation kinetics of Ni3Al with various boron contents at different temperatures obeys the parabolic law. The compounds with 0.11 to 0.20wt％ B show the best oxidation resistance .The morphology and microstructure of the scales have also been investigated.

Key words: Ni{sub}3Al, 金属间化合物, 硼作用, 氧化